<template>
  <el-menu
    :default-active="activeMenu"
    mode="horizontal"
    @select="handleSelect"
  >
    <template v-for="(item, index) in topMenus">
      <el-menu-item
        :style="{ '--theme': theme }"
        :index="item.path"
        :key="index"
        v-if="index < visibleNumber"
        ><svg-icon
          :icon-class="item.meta.icon + '-l'"
          style="height: 16px; width: 16px; margin-right: 5px"
        />
        {{ item.meta.title }}</el-menu-item
      >
    </template>

    <!-- 顶部菜单超出数量折叠 -->
    <el-submenu
      :style="{ '--theme': theme }"
      index="more"
      v-if="topMenus.length > visibleNumber"
    >
      <template slot="title">更多</template>
      <template v-for="(item, index) in topMenus">
        <el-menu-item
          :index="item.path"
          :key="index"
          v-if="index >= visibleNumber"
          ><svg-icon :icon-class="item.meta.icon" />
          {{ item.meta.title }}</el-menu-item
        >
      </template>
    </el-submenu>
  </el-menu>
</template>

<script>
import { constantRoutes } from "@/router";
import { getRouters } from "@/api/menu";
export default {
  data() {
    return {
      // 顶部栏初始数
      visibleNumber: 5,
      // 是否为首次加载
      isFrist: false,
      // 当前激活菜单的 index
      currentIndex: undefined,
      listmenu: [],
    };
  },
  computed: {
    theme() {
      return this.$store.state.settings.theme;
    },
    // 顶部显示菜单
    topMenus() {
      let topMenus = [];
      this.routers.map((menu) => {
        if (menu.hidden !== true) {
          // 兼容顶部栏一级菜单内部跳转
          if (menu.path === "/") {
            topMenus.push(menu.children[0]);
          } else {
            topMenus.push(menu);
          }
        }
      });
      return topMenus;
    },
    // 所有的路由信息
    routers() {
      return this.$store.state.permission.topbarRouters;
    },
    // 设置子路由
    childrenMenus() {
      var childrenMenus = [];
      this.routers.map((router) => {
        for (var item in router.children) {
          if (router.children[item].parentPath === undefined) {
            if (router.path === "/") {
              router.children[item].path =
                "/redirect/" + router.children[item].path;
            } else {
              if (!this.ishttp(router.children[item].path)) {
                router.children[item].path =
                  router.path + "/" + router.children[item].path;
              }
            }
            router.children[item].parentPath = router.path;
          }
          childrenMenus.push(router.children[item]);
        }
      });
      return constantRoutes.concat(childrenMenus);
    },
    // 默认激活的菜单
    activeMenu() {
      const path = this.$route.path;
      let activePath = this.defaultRouter();
      if (path.lastIndexOf("/") > 0) {
        const tmpPath = path.substring(1, path.length);
        activePath = "/" + tmpPath.substring(0, tmpPath.indexOf("/"));
      } else if ("/index" == path || "" == path) {
        if (!this.isFrist) {
          this.isFrist = true;
        } else {
          activePath = "index";
        }
      }
      var routes = this.activeRoutes(activePath);
      if (routes.length === 0) {
        activePath = this.currentIndex || this.defaultRouter();
        this.activeRoutes(activePath);
      }
      return activePath;
    },
  },
  beforeMount() {
    window.addEventListener("resize", this.setVisibleNumber);
  },
  beforeDestroy() {
    window.removeEventListener("resize", this.setVisibleNumber);
  },
  mounted() {
    var that = this;
    this.setVisibleNumber();
    /*
    getRouters().then((res) => {
      let menus = JSON.parse(JSON.stringify(res.data));
      menus.map((menu) => {
        if (menu.hidden !== true) {
          // 兼容顶部栏一级菜单内部跳转
          if (
            menu.path !== "/" &&
            menu.meta.title !== "系统设置" &&
            menu.meta.title !== "系统工具"
          ) {
            this.listmenu.push(menu);
          }
        }
      });
    });
    */

    $(document).on("click", "#topmenu-container .el-menu-item", function () {
      var text = $(this)[0].outerText;
      setTimeout(function () {
        $("ul[id='topmenu-container'] .is-active").removeClass("is-active");
        var items = $("ul[id='topmenu-container'] .el-menu-item");
        for (var i = 0; i < items.length; i++) {
          if ($(items[i])[0].outerText == text) {
            $(items[i]).addClass("is-active");
            break;
          }
        }
      }, 200);
    });

    var items = document.querySelectorAll(".el-menu-item");
    for (var i = 0; i < items.length; i++) {
      items[i].addEventListener("click", function () {
        if ($(this).parent("ul[role='menu']").length > 0) {
          var menus = $("ul[id='topmenu-container'] li[class*='el-menu-item']");
          for (var j = 0; j < menus.length; j++) {
            if ($(menus[j]).hasClass("is-active")) {
              $(menus[j]).removeClass("is-active");
            }
          }
        }
      });
    }
  },
  methods: {
    // 根据宽度计算设置显示栏数
    setVisibleNumber() {
      //const width = document.body.getBoundingClientRect().width / 3;
      //this.visibleNumber = parseInt(width / 85);
      this.visibleNumber = 5;
    },
    // 默认激活的路由
    defaultRouter() {
      let router;
      Object.keys(this.routers).some((key) => {
        if (!this.routers[key].hidden) {
          router = this.routers[key].path;
          return true;
        }
      });
      return router;
    },
    // 菜单选择事件
    handleSelect(key, keyPath) {
      this.currentIndex = key;
      if (this.ishttp(key)) {
        // http(s):// 路径新窗口打开
        window.open(key, "_blank");
      } else if (key.indexOf("/redirect") !== -1) {
        // /redirect 路径内部打开
        this.$router.push({ path: key.replace("/redirect", "") });
      } else {
        // 显示左侧联动菜单
        this.activeRoutes(key);
      }

      setTimeout(() => {
        this.handleSelect2(key, keyPath);
      }, 100);
    },
    handleSelect2(key, keyPath) {
      this.currentIndex = key;
      if (this.ishttp(key)) {
        console.log(1);
        // http(s):// 路径新窗口打开
        window.open(key, "_blank");
      } else if (key.indexOf("/redirect") !== -1) {
        console.log(2);
        // /redirect 路径内部打开
        this.$router.push({ path: key.replace("/redirect", "") });
      } else {
        console.log(3);
        // 显示左侧联动菜单
        this.activeRoutes(key);
      }
    },
    // 当前激活的路由
    activeRoutes(key) {
      var routes = [];
      if (this.childrenMenus && this.childrenMenus.length > 0) {
        this.childrenMenus.map((item) => {
          if (key == item.parentPath || (key == "index" && "" == item.path)) {
            routes.push(item);
          }
        });
      }
      if (routes.length > 0) {
        this.$store.commit("SET_SIDEBAR_ROUTERS", routes);
      }
      return routes;
    },
    ishttp(url) {
      return url.indexOf("http://") !== -1 || url.indexOf("https://") !== -1;
    },
  },
};
</script>

<style lang="scss">
.el-submenu__title i {
  color: #ffffff !important;
}

.topmenu-container.el-menu--horizontal > .el-menu-item {
  float: left;
  height: 66px !important;
  display: flex;
  align-items: center !important;
  /* 垂直居中 */
  line-height: 50px !important;
  // color: #ffffff !important;
  padding: 0 10px !important;
  margin: 0 5px !important;
  border: unset;
  background: linear-gradient(180deg, #0241b2, #0242b3) !important; //选中背景色
  font-size: 18px;
  font-family: Source Han Sans CN, Source Han Sans CN-Light;
  font-weight: 300;
  text-align: left;
  color: rgba(255, 255, 255, 0.8) !important;

  &:hover {
    background: linear-gradient(
      0deg,
      rgba(1, 127, 252, 0.9),
      rgba(0, 128, 254, 0.01)
    ) !important;
  }
}

.topmenu-container.el-menu--horizontal > .el-menu-item.is-active,
.el-menu--horizontal > .el-submenu.is-active .el-submenu__title {
  // border-bottom: 2px solid #{"var(--theme)"} !important;
  // color: #303133;
  background: linear-gradient(
    0deg,
    rgba(1, 127, 252, 0.9),
    rgba(0, 128, 254, 0.01)
  ) !important;
}

/* submenu item */
.topmenu-container.el-menu--horizontal > .el-submenu .el-submenu__title {
  float: left;
  height: 66px !important;
  display: flex;
  align-items: center !important;
  /* 垂直居中 */
  line-height: 50px !important;
  padding: 0 5px !important;
  margin: 0 10px !important;
  font-size: 18px;

  font-family: Source Han Sans CN, Source Han Sans CN-Light;
  font-weight: 300;
  text-align: left;
  color: rgba(255, 255, 255, 0.8) !important;

  // background: linear-gradient(180deg, #0241b2, #0242b3) !important; //选中背景色
  &:hover {
    background: linear-gradient(
      0deg,
      rgba(1, 127, 252, 0.9),
      rgba(0, 128, 254, 0.01)
    ) !important;
  }
}
</style>
